Eriocaulon microcephalum is known in the flora only from one locality, Kern County, California; this was a collection by L. J. Xantus de Vesey in 1857--58 from "vicinity of Fort Tijon." It has not been found since. The specimen differs, however, in no way from those I have seen throughout the range, and in light of the number of Mexican western cordilleran plant species that have been continuously discovered in California, it seems best to include the species here.